@RafaelNC, logic dictates that it cannot be a memory issue else things wouldn't have worked on any of the browsers. However, I'll still suggest you try tweaking the memory settings. You can give this a try - viewtopic.php?p=15752#p15752
I tested KCFinder on Safari 7.0.6 and didn't experience the issue Rafael. This must be specific to your web server or Macs.
Those errors are displayed by KCFinder when the initial AJAX request (to populate the file and directory panes) fails at includes/kcfinder/js/browser/init.js on line 122. I would require access credentials if you wanted me to look into the issue further.
First of all, this is my first post at the forum and i am very happy with COUCH and using it in my second project right now. Recently i discovered that new KCFinder option as file chooser. Is there any way to set language for KCFinder? I saw "lang" just below "kcfinder" directory folder and necessary language pack but i am struggling about setting the one that i desire.